/**
 * (C) Copyright IBM Corp. 2010, 2015
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

package com.ibm.bi.dml.runtime.instructions.cp;

import com.ibm.bi.dml.lops.MapMultChain.ChainType;
import com.ibm.bi.dml.runtime.DMLRuntimeException;
import com.ibm.bi.dml.runtime.DMLUnsupportedOperationException;
import com.ibm.bi.dml.runtime.controlprogram.context.ExecutionContext;
import com.ibm.bi.dml.runtime.instructions.Instruction;
import com.ibm.bi.dml.runtime.instructions.InstructionUtils;
import com.ibm.bi.dml.runtime.matrix.data.MatrixBlock;
import com.ibm.bi.dml.runtime.matrix.operators.Operator;

/**
 * 
 * 
 */
public class MMChainCPInstruction extends UnaryCPInstruction
{	
	
	private ChainType _type = null;
	private int _numThreads = -1;
	
	public MMChainCPInstruction(Operator op, CPOperand in1, CPOperand in2, CPOperand in3, CPOperand out, ChainType type, int k, String opcode, String istr)
	{
		super(op, in1, in2, in3, out, opcode, istr);
		_cptype = CPINSTRUCTION_TYPE.MMChain;
		_type = type;
		_numThreads = k;
	}
	
	/**
	 * 
	 * @param str
	 * @return
	 * @throws DMLRuntimeException
	 */
	public static Instruction parseInstruction ( String str ) 
		throws DMLRuntimeException 
	{
		//parse instruction parts (without exec type)
		String[] parts = InstructionUtils.getInstructionPartsWithValueType( str );		
		InstructionUtils.checkNumFields( parts, 5, 6 );
	
		String opcode = parts[0];
		CPOperand in1 = new CPOperand(parts[1]);
		CPOperand in2 = new CPOperand(parts[2]);
		
		if( parts.length==6 )
		{
			CPOperand out= new CPOperand(parts[3]);
			ChainType type = ChainType.valueOf(parts[4]);
			int k = Integer.parseInt(parts[5]);
			
			return new MMChainCPInstruction(null, in1, in2, null, out, type, k, opcode, str);
		}
		else //parts.length==7
		{
			CPOperand in3 = new CPOperand(parts[3]);
			CPOperand out = new CPOperand(parts[4]);
			ChainType type = ChainType.valueOf(parts[5]);
			int k = Integer.parseInt(parts[6]);
			
			return new MMChainCPInstruction(null, in1, in2, in3, out, type, k, opcode, str);
		}
	}
	
	@Override
	public void processInstruction(ExecutionContext ec)
		throws DMLUnsupportedOperationException, DMLRuntimeException 
	{
		//get inputs
		MatrixBlock X = ec.getMatrixInput(input1.getName());
		MatrixBlock v = ec.getMatrixInput(input2.getName());
		MatrixBlock w = (_type==ChainType.XtwXv) ? ec.getMatrixInput(input3.getName()) : null;

		//execute mmchain operation 
		 MatrixBlock out = (MatrixBlock) X.chainMatrixMultOperations(v, w, new MatrixBlock(), _type, _numThreads);
				
		//set output and release inputs
		ec.setMatrixOutput(output.getName(), out);
		ec.releaseMatrixInput(input1.getName());
		ec.releaseMatrixInput(input2.getName());
		if( w !=null )
			ec.releaseMatrixInput(input3.getName());
	}
	
	public ChainType getMMChainType()
	{
		return _type;
	}
}
